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Siemens Powermite 599 MT Series Technical Instructions

Sqs electronic valve actuator, 24 vac, floating control (3-position)
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Powermite 599
MT Series SQS Electronic
Valve Actuator, 24 Vac,
Floating Control (3-position)
Description
Features
Application
Product Number
Ordering
Information
The Powermite 599 MT Series SQS85.53U Electronic Valve Actuator requires a 24 Vac
supply and receives a floating control signal to provide three-position control. The
actuator controls Powermite 599 Series MT Series terminal unit valves with a 7/32-inch
(5.5 mm) stroke. With no control voltage or in the event of a power failure, a mechanical
spring allows the valve to return to its normal (fail-safe) position.
• Maintenance-free with reversible motor.
• UL listed for plenum installations.
• Floating control signal input.
• Mechanical spring returns the valve to its normal (fail-safe) position in power-off
condition.
For use in small to medium HVAC installations with Powermite 599 Series MT Series
terminal unit valves and Siemens Building Technologies standard valves with a
7/32-inch (5.5 mm) stroke requiring a minimum of 90 pounds force (400N). They can be
used in liquid and low pressure steam service applications.
SQS85.53U
To order a complete valve plus actuator assembly from the factory, combine the
actuator prefix code with the suffix of the valve product number. See TB251, Powermite
599 Series MT Series Terminal Unit Valve and Actuator Assembly Selection
(155-306P25) for selection procedures.
To order an actuator only, use the product number.
Technical Instructions
Document No. 155-308P25
Actuator prefix code
EA 599-14
March 17, 2015
266
Siemens Industry, Inc.

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Summary of Contents for Siemens Powermite 599 MT Series

  • Page 1 Floating Control (3-position) Description The Powermite 599 MT Series SQS85.53U Electronic Valve Actuator requires a 24 Vac supply and receives a floating control signal to provide three-position control. The actuator controls Powermite 599 Series MT Series terminal unit valves with a 7/32-inch (5.5 mm) stroke.

  • Page 2: Specifications

    41°F to 248°F (5°C to 120°C) Physical Characteristics Conduit opening Knockouts for standard 1/2-inch (12.7 mm) conduit connector Weight 1.3 lb (0.6 kg) Dimensions See Figure 3. Service Kit If the actuator is inoperative, replace the unit. Page 2 Siemens Industry, Inc.

  • Page 3: Operation

    The maximum rating for Class 2 step-down transformers is 100 VA. Do not power more than 10 actuators with one transformer. (Use 0.5 amp fuse on secondary per actuator.) WARNING: Housing rated for flex conduit only. Siemens Industry, Inc. Page 3...

  • Page 4: Wiring Diagrams

    Three-Way Valve: • When the actuator shaft extends (0 to 1), the valve opens between port A and AB. • When the actuator shaft retracts (1 to 0), the valve opens between port B and BA. Page 4 Siemens Industry, Inc.

  • Page 5: Troubleshooting

    Information in this publication is based on current specifications. The company reserves the right to make changes in specifications and models as design improvements are introduced. Product or company names mentioned herein may be the trademarks of their respective owners. © 2015 Siemens Industry, Inc. Siemens Industry, Inc.